SOLID principles

 

Single Responsability Principle

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  Responsability of change, source of change accord to different domains,  for example CFO, COO, CTO

 

 

Many ways to separate the inference. using concrete classes. by multiple inheritance ( not allowed in java) but could use interfaces.  using facade ...

 

Open/Close Principle

 

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Example 2

 

 

Adding a new operation class, forces Calculator Class to be modified.

 

 

With the Refactor, adding a new operation class the Calculator Class is not modified.

 

Liskov Principle

 

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Interface Segregation Principle

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Dependency Inversion Principle

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eot